How does the EU expect French operators to operate in Spain?

Well, on international passenger lines, that will be easy: when the line across the Perthus tunnel opens, no gauge problem. But French (or Italian, or German, or private SPanish) operators can buy gauge-changing trains, too. Freight is another issue, but one limiting even traditional transport with handover at borders. I somehow feel Ricardo's Principle is at work here.

_{*Lunatic*, n.
One whose delusions are out of fashion.}